bionic (8) radrelay.8.gz

Provided by: freeradius-common_3.0.16+dfsg-1ubuntu3.2_all bug

NAME
       radrelay -- Deprecated command.


DESCRIPTION
       The  functions  of  radrelay have been added to radiusd.  One benefit is that one instance of radiusd can
       read multiple detail files, among others.

       The rlm_sql_log module does something similar, but for SQL queries.  See it's man page for details.


REPLICATION FOR BACKUPS
       Many sites run multiple radius servers; at least one primary and one backup server. When the primary goes
       down, most NASes detect that and switch to the backup server.

       That  will  cause  your accounting packets to go the the backup server - and some NASes don't even switch
       back to the primary server when it comes back up.

       The result is that accounting records are missed, and/or the administrator must  jump  through  hoops  in
       order  to  combine  the  different  detail  files  from  multiple servers. It also means that the session
       database ("radutmp", used for radwho and simultaneous use detection) gets out of sync.

       We solve this issue by "relaying" packets from one server to another, so they both have the same  set  of
       accounting data.

       See raddb/sites-available/buffered-sql for more information.


BUFFERING FOR HIGH-LOAD SERVERS
       If  the RADIUS server suddenly receives a many accounting packets, there may be insufficient CPU power to
       process them all in a timely manner.  This problem is especially noticeable when the  accounting  packets
       are going to a back-end database.

       Similarly,  you  may  have  one  database that tracks "live" sessions, and another that tracks historical
       accounting data.  In that case, accessing the first database is fast, as  it  is  small.   Accessing  the
       second  database  many  be slower, as it may contain multiple gigabytes of data.  In addition, writing to
       the first database in a timely manner is important, while data may be written to the second database with
       a few minutes delay, without any harm being done.

       See raddb/sites-available/copy-to-home-server for more information.


SEE ALSO
       radiusd(8), rlm_sql_log(5)


AUTHOR
       The FreeRADIUS Server Project

                                                 23 October 2007                                     RADRELAY(8)